Walmart told the U.S. government privately in January that India’s new investment rules for e-commerce were regressive and had the potential to hurt trade ties.

The lobbying effort yielded no result at the time — India implemented the new rules from Feb. 1 — but the document underlines the level of concern at Walmart about the rules.

Differences over e-commerce regulations have become one of the biggest issues in frayed trade ties between New Delhi and Washington.

Walmart told the U.S. government privately in January that India’s new investment rules for e-commerce were regressive and had the potential to hurt trade ties, a company document seen by Reuters showed.

The lobbying effort yielded no result at the time — India implemented the new rules from Feb. 1 — but the document underlines the level of concern at Walmart about the rules. Differences over e-commerce regulations have become one of the biggest issues in frayed trade ties between New Delhi and Washington.